Composition for paving and other purposes



SALTUEL E.

. u a a 1,524,120.

I:L'o brewing:

- To ail whom. it may concern:

Be it known that T, Simruan it. Moan-Ar, a citizen of the United States,residing at Indianapolis, in the countyof Marion and State of Indiana,have invented a new and useful Composition for Paving and otherPurposes, of which the following is a speciiication.

The object of my invention is to produce a satisfactory paving or othereomposition from the ordinary earthy materials obtainable from existingdirt roads, Hid an as phaltic or bituminous cement.

Tn producing my paving cpmposition, I take ordinary earth or clay llOHLexisting roadways, orany other source, and, first freeing the same, ifnecessary, from any considerable quantities of vegetable matter,

break the same into line particles, having at least 35 percent. ofsufficient fineness to pass through aQOO-niesh sieve, and having noparticles larger than inch. This earthy, or n'iineral, aggregate iseither before or afterbreaking, placed in a suitable drier, or combineddrier and mixer, where it is heated to a temperature of from 225 to 350degrees Fahrenheit, the heat beingniaintained a suflicient time to driveofi themois-- of a bituminous cement, soluble in carbon disulfid will besuflicient for this stage the operation.

' After the mixture, referred to above, has been thoroughly produced sothat each par- I ticle will if possible be coated with the cement, it isremoved Iromthe miner and al-- lowed to cool, preferably in layers whichare not too thick to prevent ready break ing up when required for finalbreaking operation. The mixture which has 311st been binder layer, inthe usual manner, upon any suitable foundation.

In order to be prepared for use as a wearing surface, the mixture justdescribed, af-

' ter having cooled, ispul'verized to such a degree offiheness'that from50 to 90 per cent. of the mixture will pass through a ea a Applicationfiled April 1,

I/IUPJRAY, OE INDIAiNAPOLIS, INDIANA.

CQTJIPQSITION 'ifEAVIIIG AND @THER PURPOSES.

Specification of Letters Patent. Patented Jan. 13, 192(1 191a. Serialrecesses;

QOO-mesh siei e and none of the particles be larger than inch 1ndiameter. Thereupon, the pulverized materlalis heated in a suitabledrier, or drier and mixer, to a the mirzture is to be used and thedegree of .pulverlzation. The recommended penetra '-'tion should rangebetween 30 and 100 (Dow standard),-allowance being made for someabsorption of the lighter oils of the bitumen.

While a degree of pulyerization which. will produce at least 50 percent.of particles ,whic will pass through a'200-1nesh sieve makes asatisfactory pavement, I prefer a higher degree of pulyerizatilon. Afterthe second pulverization, heating and addition of bituminous cement, themixture is deposited at the desired point, in heated condition, andcompacted by any Well known means and in the mannercommon intheproduction of sheet asphalt pavement.

I-have found that by the'proces's outlined above, I aim able to producean entirely satisfact'ory'paving composition from clay-and other earthymaterials which have hereto fore appeared to be unsatisfactory in theproduction of bituminous pavement.

I am aware-that it has heretofore been proposed to mix'ipulverized earthwith an asphaltic or bituminous cement and use the mixture for a pavingcomposition, but such a mixture has'beenunsatisfactory,because itisapparently-not possible practically to thoroughly coat all of the fineparticles espe cially if the pulverizationbe carried to as high a degreeas has been specified, but, instead, considerable quantities of imcoatedparticles will be. produced in the mixture and,.,thse, when. subjectedto wear, will break down and the pavement go to pieces. By allowing thispreliminary mixture to cool and harden, and subjecting it toa sec-.described may housed, in its hot state, as a 0nd pulverization, reheatng and remixture with additional cement,'I find that not only are thelarger particles broken. u ,and the pockets of unco'ated pulverizern'aterial broken open and dissipated, but that the brute initial addedhot cement ismore uniformly distr1but'ed and as a consequence, a mixture18 produced which possesses highly satisfactory and uniform wearingqualities.

I claim as my lnventionz 1. A composition composed of a repul--producing at least per cent. of particles which will pass through aQOO-mesh sieve.

3. A composition conslsting of a repulverized composition of earthymaterial, pulverized to produce at least 35per cent. of

particles capable of passing through a 200- mesh sieve, heated andmixed" with sufficient bituminous cement to coat the particles; and afurther quantity of bituminous cement.

4. A composition consisting of a composition of earthy material,pulverized to pro duce at least 35 per cent. of particles capable ofpassing-througha QOO-mesh sieve, heated and mixed with sufficientbituminous cement to coat the particles; cooled, repulverized to produceparticles at least 50 per cent. of

which will pass through a :ZOO-mesh sieve, and a further quantity ofbituminous cement.

5. The process of producing a composition which consists in pulverizingearthy materials to such an extent that at least 35 per cent. will passthrough a 200-mesh sieve, heating the, pulverized material, mixingtherewith ,srifiicient bituminous cement to lightly co'at'th eparticles, cooling the mixture, repulverizing the mixture to such anextent that at least 50 per cent. of the particles will pass through a'QOO-mesh sieve, heating' the pulverized mixture and mixing therewith afurther quantity of bituminous cement I 6. The process of producing acomposition which consists in pulverizing earthy. materials, heating thepulverized material, mixing therewith suflicient bituminous cement tolightly coat the particles, cooling the mixture, repulverf2ing themixture, heating the pulverized mixture and mixing therewith a furtherquantity of bituminous cement.

In witness whereof I have hereunto set my hand at Indianapolis, Indiana,this 30th day of March, A. D. one thousand nine hundred and eighteen.

SAMUEL R. MURRAY.

